Hose Routing with Air Pods

[sam98177]

Howdy,

I've figuring on replacing the air box with pods on my 78 XS11E. Anyone here have any pics, diagrams or ideas on how they routed and/or "plugged" the hoses that used to go to the air box?

I've seen the "Pod vs Stock Box" threads, but did I miss a threading for what I'm asking for? I will probably go for Mike's XS 54 mm Pods and plug the extra hoses with filters. I was just wondering if anyone have details on how they did this mod.

(WWJD, in case you missed my oil thread ) just kidding

Sam

[CatatonicBug]

Most just put cheapo fuel filters on the lines and let them hang out into space. I suppose a short enough hose, and they would just stick up into the air.

[DiverRay]

You really want them in SLOW air, NOT hanging in a fast air flow! Short hose with a filter will work, Also "T" the vent hoses together and run it up under the tank with a filter will work AND keep out most moister.
Don't forget a filter for the breather pipe. The other option would be to tie it into ONE pod filter so any fumes are burned.

[Crazcnuk]

I don't know...

Many of the 60's and early 70's cars just hung the breather hose underneath the motor to catch the wind going under there!

You actually want the breather in moving air, so that it doesn't accumulate under you and stink.

[cueball]

suggest placing mesh filter on breather and sitting between or above pods. at idle when hot fumes are embarassing pulled up at lights.

[Crazcnuk]

I would think, actually, that filters are unecessary on crancase breathers.

What we should have in there is a pcv valve. Normally speaking there is no flow INTO the motor on those breathers. The one-way check (pcv) valve would negate any intake, yet still allow pent up pressure to escape.

I believe a secondary function of a pcv valve is to allow a small amount of crancase pressurization to negate anything from entering through any opening, and to allow a small amount of counter pressure for the nominal blow-by past the rings?

[DGXSER]

As to the PVC valve, that has been mentioned here before and I have read I belive TC post that it has been known to clog and cause issues. Most that I know running pods simply put a small simple air or fuel filter on it and call it done. just something to keep critters from calling it home.

[cywelchjr]

My understanding of PCV valve funtionality and design is that a vacuum source is required on one end with the other attached to the crankcase. PCV is Positive Crankcase Ventilation meaning through the manifold it's actually possible under some circumstances to actually achieve a slight vacuum in the crankcase. I would think you would need something like was recommended to catdna to split the vacuum flow between all 4 carbs to prevent problems. I would guess that this would be far more trouble than it would be worth.

[sam98177]

Thanks for the replies. I'll keep all this in mind, when I'm ready to reassemble the beast. Anyone have any pics of their Pod and hose-routing setup would be appreciated.

Thanks,

Sam

[Crazcnuk]

Thats why they used to hang the pcv hose under the car, to provide a 'very' slight vacuum, just to get the gases out and away from the car.

This has nothing to do with the carbs on an XS. On later cars, they started routing the pcv to the base of the carb, not just for the vacuum, but to reburn any gases that came out of the crankcase, namely unburnt fuel that made it past the rings.

What you want is a pcv valve from, say, a 1971 Pontiac Lemans SW.

Almost all the 'emmission' controls are about not letting unburnt fuel to atmosphere. This is better achieved by making the engines efficient enough that they don't let any fuel out, unburnt.

[JeeP]

Something for sure .. don't do something stupid as I did after changing my air filter for pods.

At first, after a oil change I had a oil leak from the crankcase breather. I thought, it might be a good idea to close that. I used a boat and a lock and tight it up. 5 minutes after my bike had a huge issue : oil pressure went up and my engine started burning oil big time (lot of smoke ... looked way bad). I finally decided to go to Canadian Tire store and bought a small air filter that I attached to just between the side covers under the seat. Since I did that, no issue.

[cywelchjr]

Thats why they used to hang the pcv hose under the car, to provide a 'very' slight vacuum, just to get the gases out and away from the car.

This has nothing to do with the carbs on an XS. On later cars, they started routing the pcv to the base of the carb, not just for the vacuum, but to reburn any gases that came out of the crankcase, namely unburnt fuel that made it past the rings.

What you want is a pcv valve from, say, a 1971 Pontiac Lemans SW.

Almost all the 'emmission' controls are about not letting unburnt fuel to atmosphere. This is better achieved by making the engines efficient enough that they don't let any fuel out, unburnt.

I've never seen a pcv valve hose just hung under the car. Even my 67 Chevy pickup had a pcv valve connected to the intake. Earlier cars had a breather cap, often with a hose that did hang down, but there was no valve involved, just a filter. Hanging a hose down unless I'm forgetting all my high school auto shop classes, won't provide any vacuum on that hose.

[cueball]

theory of hanging hose down is that as vehicle moves air flow creates a low pressure zone at end of hose, thereby causing fumes to travel from crankcase via hose to atmosphere. PCV valves (fed to intake side of engine) came about to recycle crankcase fumes into combustion chamber.

[digitalsam]

The crank case breather hose (is that the smaller hose on the back of the engine?) where does it attach if you are using the stock airbox?

[bikerphil]

That smaller hose, about 1/4" diameter is a breather for the middle drive unit and is to remain unplugged. I route mine down towards the ground to that hose holder bracket by the swingarm, the one the battery overflow goes thru.